2081309987 has 2 divisors, whose sum is σ = 2081309988. Its totient is φ = 2081309986.

The previous prime is 2081309963. The next prime is 2081310029. The reversal of 2081309987 is 7899031802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2081309987 - 2⁸ = 2081309731 is a prime.

It is not a weakly prime, because it can be changed into another prime (2081309917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040654993 + 1040654994.

It is an arithmetic number, because the mean of its divisors is an integer number (1040654994).

Almost surely, 2^2081309987 is an apocalyptic number.

2081309987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081309987 is an equidigital number, since it uses as much as digits as its factorization.

2081309987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 2081309987 is about 45621.3764259694. The cubic root of 2081309987 is about 1276.7687842276.

The spelling of 2081309987 in words is "two billion, eighty-one million, three hundred nine thousand, nine hundred eighty-seven".